Materials Literature
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The Ostwald ripening of alkane in water emulsions stabilized by the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) was investigated. For emulsions prepared under high-shear conditions in a microfluidizer, ripening rates do not depend on the micellar surfactant concentration. The aging process is due to the…
The electrical and thermal transport properties are characterized for layer-structured (ZnO) m In 2 O 3 ( m =5 and 9) (Z m IO) ceramics of near theoretical densities. The results of the low temperature Hall effect study suggested that the InO 2 - layers, which have oxygen defects, determine the carrier scattering mech…
To minimize degradation reactions occurring at the same time as surface modification reactions, the surface modification of poly(aryl ether ether ketone) (PEEK) film surfaces by pulsed oxygen plasma was investigated. Oxygen radicals and ion and electron concentrations in the oxygen plasma were calculated as a function…
We calculate the static and dynamic properties of single crystal, single molecule magnets consisting of equal spin $S=1/2$ or 5/2 dimers. The spins in each dimer interact with each other via the Heisenberg exchange interaction and with the magnetic induction $\mathbf{B}$ via the Zeeman interaction, and interdimer inte…
In an A-site ordered perovskite manganite Sm 1/2 Ba 1/2 MnO 3 , a new charge/orbital ordering pattern was found at room temperature. Electron diffraction studies revealed a series of superlattice reflections with modulation vectors at q 2 =(1/2, 1/2, 1/2) as well as at q 1 =(1/4, 1/4, 0) in the tetragonal setting ( a…
Superconducting and structural properties of superconducting semiconducting multilayers are investigated. These layered systems are obtained by epitaxial growth of the isomorphic monochalcogenides of Pb, Sn, and rare-earth elements on a KCl substrate. Some of these compounds are narrow-gap semiconductors (PbTe, PbS, P…
The phenomenological theory of the 90° ferroelectric domain wall previously proposed is reviewed. It has turned out that it is the depolarizing field effect that distinguishes the stable head-to-tail wall from the unstable head-to-head wall energetically. The previous model is modified to take the effect of the depola…
We apply degenerate perturbation theory to investigate the effects of magnetic anisotropy in the magnetic molecule ${\mathrm{V}}_{15}.$ Magnetic anisotropy is introduced via Dzyaloshinskii-Moriya (DM) interaction in the full Hilbert space of the system. Our model provides an explanation for the rounding of transitions…
Abstract A soluble aromatic polyimide was chloromethylated via a reaction with chloromethyl methyl ether in the presence of tin(IV) chloride to produce a new starting material for the modification of aromatic polyimides. The chemical structure of the resulting polymer was confirmed by 1 H NMR and Fourier transform inf…
Four new supramolecular compounds of Cu(II)-Ni(II) have been synthesized and characterized: [Cu(Me(2)oxpn)Ni(mu-NCS)(H(2)O)(tmen)](2)(ClO(4))(2) (1), [Cu(Me(2)oxpn)Ni(mu-NCS)(H(2)O)(tmen)](2)(PF(6))(2) (2), [Cu(oxpn)Ni(mu-NCS)(NCS) (tmen)](n) (3), and [Cu(Me(2)oxpn)Ni(mu-NCS)(NCS)(tmen)](n) (4), where oxpn = N,N'-bis(…
Electric-field-induced cholesteric liquid crystal phase gratings were investigated by means of changing the film thickness-to-natural-pitch ratio d / p 0 and the applied voltage. Planar parallel (180°)-, antiparallel (0°)- and twist (90°)-aligned films were fabricated. By varying the d / p 0 value, we found that the s…
The protonic conduction of Sc-doped SrZrO 3 (SrZr 1- x Sc x O 3 ) in the single crystal form is investigated. The SrZr 1- x Sc x O 3 crystals exhibit significantly higher conductivity than the pure ones, and the crystal with x =0.05 exhibits the highest conductivity of those masured. The activation energy of the SrZr…
An organic reagent-assisted method has been developed for the synthesis and assembly of copper sulfide, cadmium sulfide and silver sulfide nanocrystallites at low temperature under hydro- or solvothermal conditions. Nanowire-like aggregates (with an average diameter of 120 nm and length of 2 μm) assembled by digenite…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRegioregular Poly(4-alkylquinoline)s: Synthesis, Self-Organization, and PropertiesYan Zhu, Maksudul M. Alam, and Samson A. JenekheView Author Information Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, Washington 98195-1750 Cit…
This work describes the synthesis and the conformational properties of new polymethylated macrocyclic ligands of potential interest for magnetic resonance imaging. M4cyclen, (2S,5S,8S,11S)-2,5,8,11-tetramethyl-1,4,7,10-tetraazacyclododecane, was obtained by cyclotetramerization of (2S)-1-benzyl-2-methylaziridine follo…
We have employed the first-principles molecular dynamics method to study the stabilities and electronic properties of bismuth nanotubes. There are some stable bismuth nanotubes. The strain energies of Bi( n , n ) nanotubes follow the classical 1/ D 2 strain law. For small Bi( n , 0) nanotubes, the strain energies show…
The figure of merit ZT of thermoelectric materials has been evaluated by the Harman method in the temperature region below room temperature. In this method only resistance measurements by both dc and ac methods are required to obtain the ZT values. ZT is given by ZT =( R dc / R ac -1)/ x , where R dc , R ac and x are…
Ag(2)Cu(2)O(3) is the first known silver copper oxide. It was prepared by coprecipitation at room temperature and ambient pressure and shows an increased thermal stability compared with silver oxides. The crystal structure (tetragonal, a = 5.8862(2) A, c = 10.6892(4) A, Z = 4, I4(1)/amd) was refined from neutron and X…
How are the properties of a metal changed by strong inelastic scattering? We investigate this question within the two-dimensional t-J model using extended dynamical mean field theory and a generalized noncrossing approximation. Short-ranged antiferromagnetic fluctuations lead to a strongly incoherent single particle d…
Frequency Modulation Response of a Tunable Birefringent Mode Nematic Liquid Crystal Electrooptic Device Fabricated by Doping Nanoparticles of Pd Covered with Liquid-Crystal Molecules, Yoshikawa, Hiroaki, Maeda, Kenji, Shiraishi, Yukihide, Xu, Jun, Shiraki, Hiroyuki, Toshima, Naoki, Kobayashi, Shunsuke